如本页所示，小方格子背景

CSS代码

body {
        background:url("data:image/gif;base64,R0lGODlhBwAGAKIAAAAAAP///8nJycjIyLm5ubi4uP///wAAACH5BAEAAAYALAAAAAAHAAYAAAMQOCOiTaREVmpU0C6pR8xDAgA7") repeat;
}

repeat重复

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